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RabbitMQ `3.9.19` is a maintenance release in the `3.9.x` release series.
Please refer to the **Upgrading to 3.9** section from [v3.9.0 release notes](https://github.com/rabbitmq/rabbitmq-server/releases/tag/v3.9.0) if upgrading from a version prior to 3.9.0.
This release requires at least Erlang 23.2, and supports Erlang 24. [RabbitMQ and Erlang/OTP Compatibility Matrix](https://www.rabbitmq.com/which-erlang.html) has more details on Erlang version requirements for RabbitMQ.
## Changes Worth Mentioning
Release notes can be found on GitHub at [rabbitmq-server/release-notes](https://github.com/rabbitmq/rabbitmq-server/tree/v3.10.x/release-notes).
### Core Server
#### Enhancements
* A minor quorum queue optimization.
GitHub issue: [#4873](https://github.com/rabbitmq/rabbitmq-server/pull/4873)
#### Bug Fixes
* Avoid seeding default user in old clusters that still use the deprecated `management.load_definitions` option.
This could result in an extra user, `guest` or under an [overriden default user name](https://rabbitmq.com/access-control.html#default-state), to appear
in addition to the user accounts imported from definitions.
Note that the default user with well-known name [can only connect from `localhost` by default](https://rabbitmq.com/access-control.html#loopback-users), so
this would not expose reasonably configured production nodes to remote connections.
GitHub issue: [#4904](https://github.com/rabbitmq/rabbitmq-server/pull/4904)
* Streams could run into an exception or fetch stale stream position data in some scenarios.
GitHub issue: [#4898](https://github.com/rabbitmq/rabbitmq-server/pull/4898)
* `rabbitmqctl set_log_level` did not have any effect on logging via [`amq.rabbitmq.log`](https://rabbitmq.com/logging.html#log-exchange) (the system exchange for logging)
Contributed by Péter @gomoripeti Gömöri (CloudAMQP).
GitHub issue: [#4891](https://github.com/rabbitmq/rabbitmq-server/pull/4891)
### CLI Tools
#### Bug Fix
* `rabbitmq-diagnostics status` is now more resilient and won't fail if free disk space monitoring
repeatedly fails (gets disabled) on the node.
GitHub issue: [#4900](https://github.com/rabbitmq/rabbitmq-server/pull/4900)
## Dependency Upgrades
* `ra` upgraded from [`2.0.11` to `2.0.13`](https://github.com/rabbitmq/ra/compare/v2.0.11...v2.0.13)
## Source Code Archives
To obtain source code of the entire distribution, please download the archive named `rabbitmq-server-3.9.19.tar.xz`
instead of the source tarball produced by GitHub.
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